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GK QUESTION#3006

In which direction does sliding friction act relative to an object sliding over a stationary surface?

  1. AIn the same direction as the motion
  2. BAt right angles to the direction of motion
  3. CIn a random direction
  4. DOpposite to the direction of motionCorrect answer
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Answer

D. Opposite to the direction of motion

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Explanation

Sliding friction acts opposite the relative sliding velocity of the contacting surfaces. This does not mean every friction force opposes the object’s overall motion: static friction can propel a person or a driven wheel forward.

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